Electric immersion-heater.



F. KUHN & J. A. HAND.

ELECTRIC lMMERSION HEATER.

APPLICATION man FEB-'21, 191s.

Patented Dec. 17, 1918.

MW MA-WW JAY A. HAND, both citizens States of America,

- ers, of which the following reference being bad therein .to theacconiv designed foru'se in the immersion heater which is ofcomparatively tion the'heating lindrical casing of small dimensions,which similar tubular- STATES "PATENT ()F FRANK Karin Ann .iAY

,A. HAND, or nnrnorr, MICHIGAN, assIeNoRs-To'AMnRIcAu ELECTRICAL HEATERCOMPANY, OF DETRQIT, MICHIGAN, A CORPORATION OF,

7 mronrenn;

- Specification of Letters Patent.

ELECTRIC rlvnvrnnsron-nnnrnn.

Patented Dec, 17, 1918.

Application filed February 21, 1918. Serial No. 18,401.

To, all who'm'it may concern Be it knownthat we, FRANK K HN- and of theUnited both residing at Detroit, in the county ofWayne and State ofMichi gan, have invented certain new and useful Improvements in ElectricImmersion-Heatpanyingdrawings. 1 he inventionrelates to electric heaterseating of liquids by'immersion thereinto, and the,;j invention comprisesthe-novel constructionja's hereinafter set forth. i

,In the drawings:

Figure l is a perspective-,view cifthe heater;

Fig. 2- is a central longitudinal section therethrough; v FFig. is across-section on line 33 igf i is an elevation of a portion of theheating unit showing the manner of winding the same; and

Fig. 5 is a perspecti i ejview illustrating the manner ofassembly. e

For many uses it is desirable 'to have an high electrical resistanceandis also very compactso that it-may be inserted into a small vessel.With our improved. construe element is placed 1n 2. oy-

in turn is connected with a shank for the terminal conductors having aplug socket at its outer end. The heat ng unit is formed of a series offlatthin insulator cores, preferably of mica, on which is wound acontinuous resistor, and the several sections are insulated from eachother by interposed strips of mica. or otherinsulator. In detail, and'asshown in Flgs. 4 and 5,

are formed with apertures B B for the as sage of clamping screws andaround w ich is spirally wound a continuous res1sto r C. The resistorpasses across from one strip to the adjacent iine alternately atopposite ends so-as to permit ofassembly in zigzag form, as shown inFig. 5. Mica strips D of greater width are then inserted between theadjacent resistor-wound strips so as to separate and insulate the same,and corresponding insulatingstrips are placed outside the outerresistor-wound sections,

and screws F. Theseplates' and screws hold the,

is a specification,

conducting contact. f may be imparted to etc., are the mica core strips,which all being held nil/proper relative position by the alinedapertures, B therein. E are" heat-absorbing and distributing clampingplates arranged upon opposite sidesof the series of sections secured toeach-other by the clamping series'from' displacement and also placesufiicient pressure thereon to insure good heat the reslstor byincreasingor-diminishing the number of wound sections, and on account ofthe good heat conduction the-inner sections will not rise 4 intemperature above the safe limit.

The heating unit formed as described is inserted in a tubular outercasing G, closed at one end and at its opposite end engageable With ashanktube H through which the terminal ends of the resistor pass. TheseAny desired resistanceterminal portions are insulated. by surroundinginsulator tubes I and at their outer ends are connected with enlargedterminal con- 'tacts J. These terminal contacts are secured Theconstruction as described may be used by inserting the casing into theliquid to be' heated and engaging a plug, such as M, with the socket inated in the resistor passes rapidly outward through the heat-absorbingand distributing members E, whiclnbeing in heat conducting relation to.the outer casing, --will quickly transfer the heat tothe liquid.

What we claim as our invention is:

- 1. An electric immersion heater, comprising a heating unit havin I aseries of superposed flat sections wound with a continuous resistor withinterposed flat insulation, heatabsorbing and distributing membersclamped upon opposite sides of theseries, having fiat faces for engagingthe same; and forming in connection therewith complementary por- Thus inthe casing L. The heat genertions ofa circular cro'ss' sectiom-and atubu- "nalends of the resistor pass, a

.lar casing in which said unit is inserted closed at its lower end andhaving terminal connections at its upper end.

2. An electric immersion heater, comprising a fiat elongated heatingunit, heat-absorbing and distributing members onopposite sidesof saidheating unit and segmental 1n cross-section to form complementary portions of a circular crosssect1o-n, a .tubular housing closed at itslower end and recei vtubular shank of "mg said heating unit, a smallerdiameter through which the termiterminal socket having an end portionfor fitting said tubular'shank, and means for sealing the joints betweensaid tubular shank, the tubular casing and said terminal socket.

3. An electric lmmersion heater, comprisadapted for engagement 'in-g afiat"elongated heating unit, segmental ends of the resistor, and ahousing telescopically engaging said tubular shank, and inclosing saidinsulator block and terminalcontacts.

FRANK KUHN; JAY A. HAND.

with the terminal In testimony whereof Weaflix our signa-' 'tures.

